One of the characteristics of gravure printing is the variety of substrates. Common materials are paper, plastic film, aluminum foil and composite materials. In the printing production, how to properly select the substrate according to the characteristics of the package contents, and organize it reasonably, so that it can not only effectively protect the goods, but also can express the shape, style and color of the products, highlight the sense of the times, and produce high quality. An important prerequisite for flexible packaging. For packaging of crispy biscuits, since it needs to be placed on the shelf for a long time after packaging, the moisture permeability of the packaging material is required to be low, and the biaxially oriented polypropylene film can be used as the outer layer, and the low-density polyethylene film can be used as the inner layer. Floor. For example, dry packaging of tofu, because of the need for retort sterilization, therefore, requires packaging materials to have better retort resistance, polyester film or polyamide film can be used as the outer layer, and a flowing polypropylene film is used as the inner layer. This requires the printing professional to correctly select and use the printed substrate in order to achieve the desired packaging effect.
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